CN111342633A - Three-phase power generation device with high-power-density outer rotor structure - Google Patents

Abstract

The invention discloses a three-phase power generation device with a high power density outer rotor structure. , the inner stator iron core is fixedly arranged on the inner side of the magnetic pole, and the coil winding is wound in the winding slot of the inner stator iron core; each magnetic pole includes a large magnetic steel, a first small magnetic steel and a second small magnetic steel, the first small magnetic steel The magnetic steel and the second small magnetic steel are closely arranged and have the same polarity at the close end. The large magnetic steel is arranged on the inner side of the first small magnetic steel and the second small magnetic steel. The polarities of the close ends of the small magnet and the second small magnet are the same, and the polarities of the large magnet, the first small magnet and the second small magnet in the adjacent magnetic poles are all opposite. The invention makes rational use of the space inside the outer rotor structure to form an effective magnetic field with high power density, and has the advantages of simple structure, low cost and good heat dissipation performance.

Description

A three-phase power generation device with a high power density outer rotor structure

technical field

The invention relates to the technical field of generators, in particular to a three-phase power generation device with a high power density outer rotor structure.

Background technique

At present, the electromagnetic structure of the traditional three-phase power generation structure mostly forms a magnetic field through the opposite magnetic poles. The magnetic field line has a long transmission distance, a large magnetic resistance, and a serious magnetic leakage phenomenon, which leads to a low space utilization rate and power density of the power generation device. Therefore, it is impossible to form an effective magnetic field with high power density, and a large space must be occupied to ensure a certain power, resulting in a heavier weight of the power generation device.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a three-phase power generation device with a high power density outer rotor structure, so as to solve the above-mentioned problems in the prior art, so that the space inside the outer rotor structure can be reasonably utilized to form an effective magnetic field with high power density, And the structure is simple, the cost is low, and the heat dissipation performance is good.

For achieving the above object, the present invention provides the following scheme:

The invention provides a three-phase power generation device with a high power density outer rotor structure, comprising an outer rotor, an inner stator iron core and coil windings, the outer rotor includes a rotor bracket and magnetic poles, the number of the magnetic poles is N, N≥4 , a plurality of the magnetic poles are uniformly fixed on the same circumference on the inner side of the rotor support, the plurality of the magnetic poles are all symmetrical about the axis of the rotor support, the inner stator iron core is fixedly arranged on the inner side of the magnetic pole, the The coil winding is wound in the winding slot of the inner stator core, and the center of the rotor bracket is used for driving connection with the rotating shaft;

Each of the magnetic poles includes a large magnetic steel and a first small magnetic steel and a second small magnetic steel with the same shape, and the large magnetic steel, the first small magnetic steel and the second small magnetic steel are all fixed at the place. On the rotor bracket, the first small magnetic steel and the second small magnetic steel are arranged in close contact with the ends of the same polarity, and the large magnetic steel is arranged on the first small magnetic steel and the second small magnetic steel. The inner side of the small magnetic steel, the outer surface of the large magnetic steel and the inner surfaces of the first small magnetic steel and the second small magnetic steel are matched with each other and are in close contact with each other, and the poles of the inner surface of the large magnetic steel The polarity is the same as the polarity of the abutting ends of the first small magnetic steel and the second small magnetic steel, and the large magnetic steel, the first small magnetic steel and the second small magnetic steel in the adjacent magnetic poles have the same polarity. The polarities of the magnets are opposite.

Preferably, a certain magnetic gap is left between the large magnetic steel and the iron core yoke of the inner stator iron core.

Preferably, at least two iron core teeth on the inner stator iron core correspond to one large magnetic steel, and the second small magnetic steel and the large magnetic steel in one of the magnetic poles are adjacent to the adjacent magnetic poles A closed-loop magnetic circuit is formed between the large magnetic steel and the first small magnetic steel through two adjacent iron core teeth on the same side.

Preferably, N grooves are evenly arranged on the same circumference of the rotor support, the groove walls of the grooves are all perpendicular to the tangent plane of the rotor support at the bottom of the groove wall, and the magnetic poles are installed in a one-to-one correspondence. In the groove, the first small magnetic steel and the second small magnetic steel are both arranged on the outer side of the groove, and the large magnetic steel is arranged on the inner side of the groove and is connected with the groove. Slot interference fit.

Preferably, the inner surface and the outer surface of the large magnetic steel, the first small magnetic steel and the second small magnetic steel are arc surfaces, and the bottom surface of the groove is the same as the first small magnetic steel. A circular arc surface that matches the outer arc surface of the steel and the second small magnetic steel, the large magnetic steel, the first small magnetic steel and the second small magnetic steel are all along the axial direction of the rotor support It is arranged that the sum of the thicknesses of the large magnetic steel and the first small magnetic steel or the second small magnetic steel is greater than the depth of the groove, and the first small magnetic steel and the second small magnetic steel are all larger than the depth of the groove. The thickness of the steel is all smaller than the depth of the grooves.

Preferably, a high magnetic permeability material is provided between the large magnetic steel in one of the magnetic poles and the first small magnetic steel or the second small magnetic steel in the adjacent magnetic poles. The magnetic conductive material is silicon steel sheet.

Preferably, one end of the rotor support is provided with a side plate, the other end of the rotor support is fixedly connected with an end cover, and one end of the large magnetic steel, the first small magnetic steel and the second small magnetic steel All are in contact with the side plate, and the other ends of the large magnetic steel, the first small magnetic steel and the second small magnetic steel are all in contact with the end cover.

Preferably, a plurality of threaded holes are evenly distributed on the end of the rotor support in the circumferential direction, the end cover is fixedly connected to the rotor support by means of bolts, and the edge of the end cover is evenly distributed with a number of balance protrusions in the circumferential direction.

The present invention has achieved the following technical effects with respect to the prior art:

The magnetic pole of the present invention includes a large magnetic steel and a first small magnetic steel and a second small magnetic steel with the same shape, the second small magnetic steel and the large magnetic steel in one magnetic pole and the large magnetic steel and the first small magnetic steel in an adjacent magnetic pole A closed-loop magnetic circuit can be formed between the small magnets through the inner stator iron core, which can significantly shorten the closed-loop magnetic circuit, so that N magnetic poles are set in a small range of rotor brackets, and N closed-loop magnetic circuits are formed, so that the internal The space is reasonably utilized, and an effective magnetic field with high power density can be formed, and the outer rotor can only be composed of a rotor bracket and magnetic poles, with a simple structure and low manufacturing cost. At the same time, the arrangement of the stator in the outer rotor can significantly improve the heat dissipation of the power generation device. performance.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic cross-sectional view of a three-phase power generation device with a high power density outer rotor structure according to the present invention;

FIG. 2 is a partial enlarged view of the three-phase power generation device with the high power density outer rotor structure of the present invention;

3 is a schematic diagram of a closed-loop magnetic circuit in the present invention;

Figure 4 is a schematic diagram of the present invention after the outer rotor and the end cover are fixed;

Among them: 1-rotor bracket, 2-magnetic pole, 21-first small magnet, 22-second small magnet, 23-large magnet, 3-inner stator core, 31-iron core teeth, 32-iron core Yoke, 4-coil winding, 5-groove, 6-end cap, 7-balanced convex.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1-4: this embodiment provides a three-phase power generation device with a high power density outer rotor structure, including an outer rotor, an inner stator core 3 and a coil winding 4, and the outer rotor includes a rotor support 1 and magnetic poles 2. The number of magnetic poles 2 is N, N≥4, while 32 magnetic poles 2 are selected in this embodiment, and several magnetic poles 2 are evenly fixed on the same circumference inside the rotor bracket 1, and several magnetic poles 2 are symmetrical about the axis center of the rotor bracket 1, Helps to achieve the dynamic balance of the outer rotor, the inner stator core 3 is fixedly arranged on the inner side of the magnetic pole 2, the coil winding 4 is wound in the winding slot of the inner stator core 3, and the center of the rotor bracket 1 is used for connecting with the rotating shaft. Drive connection, the shaft can drive the outer rotor to rotate.

Each magnetic pole 2 includes a large magnetic steel 23 and a first small magnetic steel 21 and a second small magnetic steel 22 with the same shape. The large magnetic steel 23, the first small magnetic steel 21 and the second small magnetic steel 22 are all fixed on the rotor bracket. 1, specifically as shown in Figures 1-3, in the cross-sectional view, the large magnetic steel 23, the first small magnetic steel 21 and the second small magnetic steel 22 are all arranged along the tangential direction of the rotor support 1, and the large magnetic steel 23 , the length direction of the first small magnetic steel 21 and the second small magnetic steel 22 are parallel to the axis of the rotor support 1, the first small magnetic steel 21 and the second small magnetic steel 22 are closely arranged and the polarity of the close end is the same, The large magnetic steel 23 is arranged on the inner side of the first small magnetic steel 21 and the second small magnetic steel 22, and the outer surface of the large magnetic steel 23 and the inner surface of the first small magnetic steel 21 and the second small magnetic steel 22 are matched with each other. In close contact, the polarity of the inner surface of the large magnetic steel 23 is the same as the polarity of the abutting ends of the first small magnetic steel 21 and the second small magnetic steel 22. The large magnetic steel 23 and the first small magnetic steel in the adjacent magnetic poles 2 21 and the second small magnetic steel 22 have opposite polarities, and a high conductivity is provided between the large magnetic steel 23 in one magnetic pole 2 and the first small magnetic steel 21 or the second small magnetic steel 22 in the adjacent magnetic pole 2. Magnetic materials, silicon steel sheets can be selected as high magnetic permeability materials to improve the magnetic permeability between the first small magnetic steel 21 or the second small magnetic steel 22 and the large magnetic steel 23 in the adjacent magnetic pole 2, reduce the magnetic leakage and Magnetic loss, improve energy conversion rate. A certain magnetic gap is left between the large magnetic steel 23 and the iron core yoke 32 of the inner stator iron core 3, and the magnetic gap is very small, so as to reduce the magnetic leakage loss.

In addition, at least two core teeth 31 on the inner stator core 3 correspond to one large magnetic steel 23 , the second small magnetic steel 22 and the large magnetic steel 23 in one magnetic pole 2 and the large magnetic steel 23 in the adjacent magnetic pole 2 A closed-loop magnetic circuit is formed between the first small magnetic steel 21 and the adjacent two iron core teeth 31 on the same side. Specifically, as shown in FIG. 3 , during the rotation of the outer rotor, no matter where the rotor bracket 1 rotates to any position, it can be ensured that there are two iron core teeth 31 corresponding to one magnetic pole 2 , so that the magnetic field line passes through the first magnetic pole 2 . The N poles of the two small magnetic steels 22 and the large magnetic steel 23 come out and shoot toward one iron core tooth 31 , and enter the S pole and the first magnetic steel 23 of the large magnetic steel 23 in the adjacent magnetic pole 2 through the other adjacent iron core tooth 31 . A small magnetic steel 21 forms a closed-loop magnetic circuit, and N magnetic poles 2 are arranged in the rotor bracket 1 in a small range, so that N closed-loop magnetic circuits can be formed. The closed-loop magnetic circuit is shortened, and the space inside the rotor bracket 1 is reasonably utilized, so that an effective magnetic field with high power density can be formed, and at the same time, the magnetic field lines can pass through the coil winding 4 as vertically as possible, which improves the power density of power generation. On the premise of achieving the same power generation, the weight of this embodiment can be significantly reduced, thereby also helping to save manufacturing costs.

N grooves 5 are evenly arranged on the same circumference of the rotor support 1, the groove walls of the grooves 5 are all perpendicular to the tangent plane of the rotor support 1 at the bottom of the groove wall, and the magnetic poles 2 are installed in the grooves 5 in a one-to-one correspondence. Both the small magnetic steel 21 and the second small magnetic steel 22 are arranged on the outer side of the groove 5 , and the large magnetic steel 23 is arranged on the inner side of the groove 5 and has an interference fit with the groove 5 . The inner and outer surfaces of the large magnetic steel 23, the first small magnetic steel 21 and the second small magnetic steel 22 are arc surfaces, and the bottom surface of the groove 5 is the same as the first small magnetic steel 21 and the second small magnetic steel 22. The large magnetic steel 23, the first small magnetic steel 21 and the second small magnetic steel 22 are all arranged along the axial direction of the rotor support 1, that is, the large magnetic steel 23, the first small magnetic steel 23, the first small magnetic steel The length directions of the steel 21 and the second small magnetic steel 22 are both parallel to the axis of the rotor support 1 , and the sum of the thicknesses of the large magnetic steel 23 and the first small magnetic steel 21 or the second small magnetic steel 22 is greater than the depth of the groove 5 , the thicknesses of the first small magnetic steel 21 and the second small magnetic steel 22 are both smaller than the depth of the groove 5 . One end of the rotor bracket 1 is provided with a side plate, the other end of the rotor bracket 1 is fixedly connected with an end cover 6, one end of the large magnetic steel 23, the first small magnetic steel 21 and the second small magnetic steel 22 are all in contact with the side plate, and the large magnetic steel 23, the first small magnetic steel 21 and the second small magnetic steel 22 are all in contact with the side plate. The other ends of the magnetic steel 23, the first small magnetic steel 21 and the second small magnetic steel 22 are all in contact with the end cover 6 to realize the axial clamping of the large magnetic steel 23, the first small magnetic steel 21 and the second small magnetic steel 22. Fasten tightly to prevent axial play. The end of the rotor bracket 1 is evenly distributed with a number of threaded holes in the circumferential direction. The end cover 6 is fixedly connected to the rotor bracket 1 by means of bolts. A number of balance protrusions 7 are evenly distributed on the edge of the end cover 6 in the circumferential direction. The position can be selectively set, so as to further realize the dynamic balance of the outer rotor and improve the balance and reliability of the power generation device.

It should be noted that the inside and outside in this embodiment are based on the perspective of the figure, the center close to the rotor support 1 is the inside, and the center far away from the rotor support 1 is the outside, and the thickness and depth refer to the radial direction of the rotor support 1 The size of the direction, the thickness of the large magnetic steel 23, the first small magnetic steel 21 and the second small magnetic steel 22 can ensure that the first small magnetic steel 21 and the second small magnetic steel 22 are embedded in the groove 5, and the large magnetic steel Both sides of 23 are in contact with the groove wall of the groove 5 and have an interference fit, and then combined with the axial fixing effect of the side plate and the end cover 6 on the large magnetic steel 23, the first small magnetic steel 21 and the second small magnetic steel 22 , so that the large magnetic steel 23, the first small magnetic steel 21 and the second small magnetic steel 22 do not move radially or axially, improve the stability of the outer rotor structure, and do not punch holes in the groove 5 The fixation of the large magnetic steel 23, the first small magnetic steel 21 and the second small magnetic steel 22 is also by means of interference fit and clamping and fixing at both ends, thereby avoiding the generation of magnetic flux leakage or magnetic loss.

As shown in FIG. 2 and FIG. 3 , the N and S poles of the large magnetic steel 23 are arranged along the radial direction of the rotor support 1 , and the N and S poles of the first small magnetic steel 21 and the second small magnetic steel 22 are arranged along the rotor support The tangential arrangement of 1; in each magnetic pole 2, if the inside of the large magnetic steel 23 is the N pole, and the outside is the S pole (that is, the side that is close to the first small magnetic steel 21 and the second small magnetic steel 22 is S pole), then the close ends of the first small magnetic steel 21 and the second small magnetic steel 22 are both N poles, and in the adjacent magnetic poles 2, the inner side of the large magnetic steel 23 is the S pole, the outer side is the N pole, and the first The abutting ends of the small magnet 21 and the second small magnet 22 are both S poles. Specifically, as shown in FIG. 3 , the magnetic field line exits through the N poles of the second small magnetic steel 22 and the large magnetic steel 23 in one magnetic pole 2 and shoots toward one iron core tooth 31 , and passes through another adjacent iron core tooth. 31 enters the S pole of the large magnetic steel 23 and the first small magnetic steel 21 in the adjacent magnetic poles 2 to form a closed-loop magnetic circuit.

Beneficial effects:

(1) In this embodiment, the magnetic pole 2 is divided into three parts: a large magnetic steel 23 and a first small magnetic steel 21 and a second small magnetic steel 22 with the same shape. The second small magnetic steel 22 and the large magnetic steel in one magnetic pole 2 A closed-loop magnetic circuit can be formed between 23 and the large magnetic steel 23 and the first small magnetic steel 21 in the adjacent magnetic pole 2 through the inner iron core teeth 31, which can significantly shorten the closed-loop magnetic circuit, so that in a small range of rotor support 1 N magnetic poles 2 are arranged inside, and N closed-loop magnetic circuits are formed, so that the space inside the rotor bracket 1 can be reasonably utilized to form an effective magnetic field with high power density, and the outer rotor can only be composed of rotor bracket 1 and magnetic pole 2, silicon steel sheet The composition and structure are simple, and since an effective magnetic field with high power density can be formed, under the premise of achieving the same power generation efficiency, the mass of the power generation device in this embodiment can be significantly reduced, thereby reducing the manufacturing cost. The arrangement can significantly improve the heat dissipation performance of the power generation device.

(2) In this embodiment, since an effective magnetic field with high strength and high power density can be generated, the output voltage waveform in the power generation state is more stable, which is convenient for rectification and power generation, and improves the waveform utilization rate.

In this specification, specific examples are used to illustrate the principles and implementations of the present invention, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention; There will be changes in the specific implementation manner and application scope of the idea of the invention. In conclusion, the contents of this specification should not be construed as limiting the present invention.

Claims (8)

1. The utility model provides a three-phase power generation facility of high power density outer rotor structure which characterized in that: the magnetic pole type motor comprises an outer rotor, an inner stator iron core and a coil winding, wherein the outer rotor comprises a rotor support and a plurality of magnetic poles, N is more than or equal to 4, the plurality of magnetic poles are uniformly fixed on the same circumference of the inner side of the rotor support, the plurality of magnetic poles are symmetrical with respect to the axis center of the rotor support, the inner stator iron core is fixedly arranged on the inner side of the magnetic poles, the coil winding is wound in a winding groove of the inner stator iron core, and the center of the rotor support is in transmission connection with a rotating shaft;

each the magnetic pole all includes big magnet steel and the first little magnet steel and the little magnet steel of second that the shape is the same, big magnet steel first little magnet steel with the little magnet steel of second is all fixed on the rotor support, first little magnet steel with the little magnet steel of second is hugged closely the setting and is hugged closely the polarity of end the same, big magnet steel sets up first little magnet steel with the inboard of the little magnet steel of second, the surface of big magnet steel with first little magnet steel with the internal surface of the little magnet steel of second all matches each other and is hugged closely, the polarity of the internal surface of big magnet steel with first little magnet steel with the polarity that the little magnet steel of second is hugged closely the end is the same, and is adjacent in the magnetic pole big magnet steel first little magnet steel with the polarity of the little magnet steel of second is all opposite.

2. The high power density three-phase power generation device of an outer rotor structure according to claim 1, wherein: a certain magnetic gap is reserved between the large magnetic steel and the iron core yoke part of the inner stator iron core.

3. The high power density three-phase power generation device of an outer rotor structure according to claim 1, wherein: at least two iron core teeth on the inner stator iron core correspond to one large magnetic steel, and a closed-loop magnetic circuit is formed between the second small magnetic steel and the large magnetic steel in one magnetic pole and between the large magnetic steel and the first small magnetic steel in the adjacent magnetic pole through two iron core teeth adjacent to each other at the same side.

4. The high power density three-phase power generation device of an outer rotor structure according to claim 1, wherein: evenly be provided with a N recess on rotor support's the same circumference, the cell wall of recess is all perpendicular cell wall bottom department rotor support's tangent plane, the installation of magnetic pole one-to-one in the recess, first little magnet steel with the little magnet steel of second all sets up the outside of recess, big magnet steel sets up the inboard of recess and with recess interference fit.

5. The high power density three-phase power generation device of an outer rotor structure according to claim 4, wherein: big magnet steel first little magnet steel with the internal surface and the surface of the little magnet steel of second are the arc surface, the bottom surface of recess be with first little magnet steel with the extrados assorted arc surface of the little magnet steel of second, big magnet steel first little magnet steel with the little magnet steel of second all follows rotor support's axial direction sets up, big magnet steel with first little magnet steel or the thickness sum of the little magnet steel of second all is greater than the degree of depth of recess, first little magnet steel with the thickness of the little magnet steel of second all is less than the degree of depth of recess.

6. The high power density three-phase power generation device of an outer rotor structure according to claim 1, wherein: and a high-permeability magnetic material is arranged between the large magnetic steel in one magnetic pole and the first small magnetic steel or the second small magnetic steel in the adjacent magnetic pole, and the high-permeability magnetic material is a silicon steel sheet.

7. The high power density three-phase power generation device of an outer rotor structure according to claim 1, wherein: one end of the rotor support is provided with a side plate, the other end of the rotor support is fixedly connected with an end cover, one end of the large magnetic steel, one end of the first small magnetic steel and one end of the second small magnetic steel are all in contact with the side plate, and the other end of the large magnetic steel, one end of the first small magnetic steel and the other end of the second small magnetic steel are all in contact with the end cover.

8. The high power density three-phase power generation device of an outer rotor structure according to claim 7, wherein: the end part of the rotor support is circumferentially and uniformly provided with a plurality of threaded holes, the end cover is fixedly connected with the rotor support through bolts, and a plurality of balance protrusions are uniformly distributed in the edge circumferential direction of the end cover.

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